If you genuinely need a translation:
Anon is talking about how several stories in the east and west feature very similar concepts and plots, despite this, they tend to attract very different audiences who are more inclined to generally like the western stuff more than the eastern or vice-versa.
For instance: both Invader Zim (an american cartoon) and Death Note (a japanese anime) feature the struggle between two super geniuses as their primary driving force for the plot, however, both fandoms aren't exactly connected in any way, despite this similarity. A fan of Death Note will usually also be a fan of NGE, Madoka Magica, etc. whereas a fan of Invader Zim will most likely also be a fan of Voltron and She-Ra.
TL;DR: Cartoon fans and weebs are different versions of the same unholy creature. God help us all